[Coco] MC6847 VGA (FPGA) Project underway...

[Brendan Donahe]

Art,

I had the understanding that SG6 didn't work right on the CoCo, too,
however, it looks to me like it can on some systems, and I don't want to
exclude the Dragon or MC-10.  (Also, I could swear that I saw 6 pixels per
character block in one of Steve Spiller's tests of SG6 on my CoCo 2.  Can
someone describe clearly what is broken?  Is it, perhaps, a limited number
of colors, caused by what pins are tied together on the board?  I obviously
have not spent much time investigating this yet...)

Adding lower case capabilities is something that is on my to-do list,
because I would like to have that, too.  Thanks for letting me know that
this feature is interesting to you.

Thanks,
Brendan

On Wed, May 25, 2016 at 11:23 PM, Arthur Flexser <flexser at fiu.edu> wrote:

> SG6 never worked right in real CoCos, and I don't think there was a single
> commercial program that used it.  Would it be possible to emulate the
> 6847T1 instead, which has the real lowercase in place of SG6?
>
> Art
>
> On Wed, May 25, 2016 at 11:11 PM, Brendan Donahe <brendan at polylith.com>
> wrote:
>
> > Ron,
> >
> > I just got PMODEs 0 and 2 working last weekend.  (That's RG2 and RG3 for
> > the "purists" that follow the 6847 spec.)  All of the modes blessed by
> > BASIC are working now.
> >
> > I'm working on the modes that are not directly supported by BASIC, such
> as
> > SG6, CG1, CG2, and RG1.  Thankfully, as of last weekend, I have a test
> > framework and a small test suite from Steve Spiller, who also reminded me
> > of William Barden's Color Computer Graphics book.  Together, these have
> > made it simpler for me to enable some of the graphics modes to try them
> out
> > and discover what is still broken in the FPGA design.  There are also
> still
> > some other small issues that Simon Jonassen has helped me identify
> through
> > his demos, but all-in-all, the project is coming along.
> >
> > I have also gotten Ed a new FPGA image that should, in theory, be
> suitable
> > for trying out the production boards - but I think you're right, Ed has a
> > ton of hardware projects on his plate, so we will need to be patient.  ;)
> >
> > Thanks for asking!
> >
> > Brendan
> >
> >
> >
> > On Wed, May 25, 2016 at 9:37 PM, Ron Klein <ron at kdomain.org> wrote:
> >
> > > Hi Ed / Brendan,
> > >
> > > Any updates on this?  It was impressive as heck to see at CoCoFEST!
> > >
> > > ... it's not as if Ed doesn't already have too many things going on ...
> > >
> > > Thanks!
> > >
> > > -Ron
> > >
> > >
> > > On Tue, Oct 13, 2015 at 1:30 PM, Brendan Donahe <brendan at polylith.com>
> > > wrote:
> > >
> > > > *drool*  Thanks, Ed!
> > > >
> > > > On Tue, Oct 13, 2015 at 1:18 PM, Zippster <zippster278 at gmail.com>
> > wrote:
> > > >
> > > > > I just got Brendan’s prototype board into the mail so he can
> further
> > > > > develop
> > > > > the code for the FPGA.
> > > > >
> > > > > Isn’t she pretty after her bath….  :)
> > > > >
> > > > > <https://drive.google.com/open?id=0B1sgl615FlGnOHlDQ1ZOMHU3RGs <
> > > > > https://drive.google.com/open?id=0B1sgl615FlGnOHlDQ1ZOMHU3RGs>>
> > > > >
> > > > > - Ed
> > > > >
> > > > > --
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